At the start of all missions there is no story text. I have updated to the most recent version, and the problem still persists. I feel like there is just some setting I can't find, but I'm stumped.
If you are replaying story missions without resetting the story progress, it may (will?) not show the opening text. On the Orbital tab under the CN(s), there is a button labeled "Archived Transmissions". Click on that to get the opening text.